Gromet



fUNlTEDjs'rA-Tss PATENT OF'FIC'.

SAMUEL ROBINSON, 0F NEW YORK, N. Y.

entonar.

Speccation of Letters Patent. Patented Oct, 19, '1920.

Application led November 29, 1918. Serial No. 264,651.

To allwhom it may concern:

Be it known that I, SAMUEL ROBINSON, a subject of the King of Great Britain and Ireland, and a resident of the city of New York, Astoria, boroughof Queens, in the county of Queens and State of New York, have invented a new and Improved Gromet, of which the following isla full, clear, and exact description. A

This invention relates to packing devices and particularly to what is known as a gromet and has for -an object the provision of an improved construction which will effectively prevent leaks around a bolt' when the nut is properly tightened. u Another object in view is .to provide a gromet with radially positioned flanges and' two laterally positioned flanges for engagin the nut or washer and the article clampe by the bolt whenthe gromet is used inconnection with a bolt.

-lio

in Fig. 2.

i 'A still further object of the invention is to provide a gromet of lead composition or other yielding material which will have a radial flange aswell as a lateral annular Aflange so that when placed adjacent a nut the invention. I

Fig. 2 is a longitudinal `,vertical Sectio through a gromet disclosing the invention.

Fig. 3 is a front view of the gromet shown Fig. l is a rear view of the gromet shown in Fi f 2. j A "Reerring tothe accompanying drawings ing a web 4, said webs abutting. ingtubes for trains or other purposes pass- 'ing beneath bodies of water it is necesary to by numerals `1 indicates a Vplate havinga depending Iweb 2 and 3 -a similar late havn providha-ve the flanges 2 and 3 clamped together for the purpose of strength and also or preventi ing the passage of water into the tube'. To

positively produce avtight joint packing is arrangedin the notch 5 which is calked 'in the usual manner of calking ships land simi'- Y lar structure-s.' The Ilan-ges 2 and 3 arecon.-

nected together by bolts 6 passing through suitable o en'ings in the lian es as shown 'in F 1g, rdmarlly water will leak through the joint between the flanges and out through the'bolt openings 7 and 8, to prevent this aA` number of rope gromets have been used heretofore and. also other constructions, but csometimes it has been found necessary to completely lll the openings 7 and -8 with rope gromets saturated with a solution be.-

fore the joint `has been made completely tight. This is expensive and requires an appreciable amount of Work in placing these grornetsl in" position until the proper tightness is secured. To'overcome this objection and to provide a positively tight connection a lead or compositiongrometl) is \used adj acent each end ofthe bolt 6. The grometA 9 is of special construction and may be made from lead or other metal which will flow to a certain extent when under great pressure. Ordinarily the grometis made with a smooth bore 10, a radial. flange 11 and` lateral flanges 12 and 13. The bore l0 is made Sullicie'ntly large to slide reasonably freely over the ends of the bolts 6 so that at' onet end thel gromet loosely ts the enlargement 14 of the lbolt and at the otnher loosely fits on top of the threads 1 5. On arranging the gromet 9 in place the comparatively large, heavy lateral flange 12 is caused to'extend into the respective openings or bores 7 and 8, while the comparatively small' lateral flange 13 projects withina the respective washers 16 and 17, said ywashers'being usually steel or other comparativelyhardrnetal.V VIt will Y be observed that both of the flanges 12 and 13 Y l are beveled as for instance at 18 and 19 so that part of the flanges willproject into the bores 7 and 8 respectively andinto the respectivewashers 16 and 17. When the nut 20 is tightened the flanges 12 and 13 will :be forced farther'and farther into their respective openings in the flanges 2 andl and in the washers. In addition the inner face of what'mayfbe' termed the body 21 of the gromet 9 is orc'ed into the threads 5 so as to tightly t the same-and Ythereby prevent any leakage at this point. The radial flange 11 is also forced tightly against the outer surface ofthe respective flanges 2 and 4' and Yconsequently they are embedded in the irregularitles Ythereo By providing lead, or

someother metal havingsubstantially thesame characteristics, only two gromets are occur after a few days. When a leak would necessary to produce a permanent tightjoint and when once placed in position no further action is necessary. Heretofore when using the rope gromet after the parts had been placed in position a leak would quite often occur with the gromet heretofore `in use it was necessary toYV remove the nut and place one or more additional gromets in place. In the present construction a positively tight joint is provided when the parts are properly placed in position? If, for any reason, the nut 20 should not be tightened sufficiently and a leak should occur it Will only be necessary to give the nut 20 one or more turns and the metal of the gromets will be forced tightly into place andl thereby produce the tight joint desired. If desired a small bead 22 could be provided on one face of the radial flange llfso as to positively insure a connection adjacent the vperiphery thereof, said bead 22 being forced against and into the flanges 2 and 4. This gromet is designed primarily to provideltight join-ts in built up tubes for tunnels under Water Ways, but it is evident that same may be used readily in other places Without departing from the spirit of the invention, the same being always used in connection With a bolt. If desired, under some circumstances th flange may be reduced or eliminated, though ordinarily this is extremely desirable.

What I claim is:

1. A gromet for tunnel casings and bolt therefor comprising a tubular body having a thickened central portion merging into a radiating flange, said body and flange being formed from material having the characteristic of lead so as to flow into thethreads and irregularities of said bolt and irregularities of said casing when applied to the.

constructed With a substantially tubularY bodyl having a centrally arranged radially extending flange, said body having the outer surface thereof tapering from the flange to the end of the body whereby there is presented a thick section at the juncture of the flan-ge and body.

4. A gromet for boltsc comprising a body having a bocle for accommodating a bolt, the

nupper part of said body tapering in opposite directions from a substantially central point, and a substantially centrally arranged 'annular radial flange projecting from the body, said flange being formed with an annular bead on one side near the periphery.

. SAMUEL ROBINSON. 

